Precast concrete metal-lined pipe



T. DE LA MARE PRECAST CONCRETE METAL LINED PIPE Dec. 24, 1929.

Filed June 15, 1927 m V m u quoocan? Patented Dec. 24, 1929 THOMAS DE LAMARE, OF SALT LAKE CITY, UTAH PREGAST CONCRETE Application filed June13,

This invention relates to a pre-cast concrete metal-lined pipe whichshall:

First. Be strong and durable.

Second. Be susceptible to economical manufacture.

Third. Have a smooth inner surface.

Fourth. Have strong, fluid-tight joints when laid.

Fifth. Be simple to install.

Sixth. Be eflicient in service.

Seventh. Provide convenient and eflicient means for making bends in thepipe when lay- 111 Tn attaining these objects, I provide a con- 1tinuous lining or hollow core, which is preferably made of light sheetmetal, such as galvanized iron.

The pipe is preferably formed in pre-cast lengths of about feet, andeach length may consist of a plurality, usually three, of sections ofthe metal lining, these sections being provided with slip joints so thatthe concrete in shrinking, shall not cause the lining to buckle.

At the joints between the lengths, I provide flaring collars or bells,which may be formed separately from the linings and afterwards riveted,or otherwise secured, near the adjacent ends of consecutive lengths ofthe metal lining.

In pre-casting the pipe, one length of the lining is provided at eachend with a suitable plug having a concentric spacing flange projectingoutwardly therefrom. These plugs are held in place in any convenientmanner, such as by a metal rod, threaded at both ends, passing throughboth plugs and provided with nuts to draw the plugs together against theends of the lining. This length with the 40 plugs, is then placed in asuitable mold and concrete is cast around the lining to form amonolithic shell enclosing the lining.

Thus is defined at each end of a length of the pre-cast pipe, ametal-lined recess, this recess being exterior in relation to the liningand interior in relation to the collar and to the concrete shell.

In laying the pipe in the field, the adjacent ends of consecutivelengths are spaced apart and joined by means of a sheet metal sleeveMETAL -LI1 TEID PIPE 1927. Serial No. 198,483.

which projects into one end of one length and over the lining of theadjacent end of the other length.

The circumferential edges of the opposing collars are perforated, andmay be drawnor held together by means of tie-wires.

sleeve may be made substantially liquid-tight with respect to eachlength, by cementing or caulking in any suitable manner. lVhere it isdesired to form a bend in the pipe, an U elbow, instead of the sleeve,may be inserted between two consecutive lengths of the pipe.

After the joint has thus been caulked or cemented, concrete is pouredaround the joint, filling the flaring ends of the two lengths, as wellas the space between them. The outside of the joint may be smoothed offto the diameter of the finished pipe, resulting in a smooth workmanlikeob.

The features of this invention for which the protection of LettersPatent is desired, are collectively grouped in the claims concludinothis specification.

Tn the drawing,

Fig. 1 represents a longitudinal center section through a finishedlength of pre-cast pipe made in accordance with this invention;

Fig. 2, a similar section showing a set-up of the lining in the moldready for the pouring of concrete Fig. 3, a detailed longitudinal centersection through a joint between two lengths ready for the pouring of theconcrete around the joints;

Fig. 1, same as Fig. 3, but showing joint completed riveted or otherwisetive sections at 18.

fastened to the respec- The collars 17 are ex- The i portion 21, and theupper side portions 24 and 25, these being preferably hinged together asindicated at 26, Fig. 5.

In using the mold, the sections 10, 12 and 14 of the lining, togetherwith the plugs 20 and the rod 27, are laid in the base portions of themold, the upper side portions of the mold being opened out, as indicatedby the dotted lines 24 and 25 This leaves the mold in shape to receivethe concrete which can be conveniently tamped into place, toapproximately the level of the line 29 (Fig. 5). By

now bringing the side portions 24 into the position indicated by thefull lines 24, and tying the two portions 24 together substantiallyalong the line 30, more concrete may be poured and tamped, substantiallyto the level of the line 30. The portions 25 may now be brought into thefinal position indicated by the full lines, thus forming a longitudinalhopper by means of the integral flanges 31, into which the final amountof concrete may be poured, leaving that particular length of pipe in thefinished pre-cast condition as shown in Fig. 1.

In laying the pipe in the field, the ends of two consecutive sections 32and 34, are brought adjacent each other and spaced apart as shown inFig. 3, the sleeve 35 having been previously slipped into place. In thisinstance, the right-hand end of sleeve 35 extends into the lining oflength 34, and over the lining of length 32, so that liquid flowingthrough the pipe in the direction of the arrow, will run over theabutting edges 14 and 35 instead of running against these edges.

Wires 36 are threaded through the perforations 37 and twisted togetheras at 38, thereby tying the consecutive lengths of pre-cast pipesecurely together. Any suitable material for caulking may now behammeredinto place, as at 39, and at 40, a strip of ordinarywire fly screen maybe wrapped over the joint, and smeared over with white lead or othersuitable plastic substance. Concrete may now 7 accomplished as indicatedin Fig. 6, where instead of using a straight sleeve, a sheet metal elbow45, may be inserted. The flaring collars of the two lengths are heldtogether by means of the ties 46 and 47 in a manner similar to thatalready described.

l Vhere this pipe is used for water mains, as in city streets, meansmust be provided for tapping the pipe for service connections. This Iaccomplish by casting inserts of metal, such as bronze, in the pipe whenfirst made, as indicated in Figs. 5 and 7. The insert 48 may be providedwith an annular rib 49, for securely anchoring the insert in theconcrete shell. The inserts are tapped and provided with plugs 51. Whenit is desired to make a connection, the plug 51 is removed, and aservice pipe such as 52, screwed into the insert. It frequently happensthat it is desired to fasten the pipe 52 by other means in addition tothe ordinary thread. To allow this to be done, a flange 50 may bethreaded at 53, and cap screws 54 be used to fasten the reinforcingportion 60 to the flange 50.

This invention is particularly useful in constructing the smaller sizesof pipes, such as from 1 inch to 12 inches inside diameter though it isnot restricted thereto. To give an idea of the thickness of the materialsuitable for making the lining or hollow core, for different diameters,the relations given following, are suggested. For 1 inch pipe, No. 30galvanized iron; for 2 inch pipe, No. 28; for 4 inch pipe, No. 26; for 6inch pipe, No. 24; and for 12 inch pipe, No. 16.

If desired, the concrete shell may be strengthened by means of steelreinforcing 61 (Fig. 5) of any well known type.

lVhile a specific embodiment of this invention is herein shown anddescribed, it is to be clearly understood that all the detailed partsthereof, may or may not be shown in the preferred forms, and, further,that the preferred forms may be varied from time to time, as thedevelopment of this invention and the arts to which it appertains,progress. Therefore, that which forms an essential and characteristicpart of this invention, will be readily discernible from the claims inwhich its spirit is broadly generalized.

Having fully described my invention, what I claim is 1. In a concretepipe, a sheet metal lining, a shell of concrete pre-cast around saidlining, and an annular recess defined at the end of said lining, saidrecess being longitudinally inward of an end face of said shell,exterior to said lining, and interior to said concrete shell; a secondsheet metal lining similarly constructed and encased, said two liningsspaced apart, a sleeve joining said linings, and a filling of concretearound said sleeve.

2. A length of pre-cast concrete pipe comprising sheet metal sectionsjoined so as to yield longitudinally in relation to one another, a shellof concrete around said lining, and a recess defined adjacent the end ofsaid length of pipe, said recess being substantially concentric with,and exterior to, said lining, and interior to said concrete shell; asecond length of pre-cast pipe similarly constituted, said two lengthsspaced apart, a sleeve joining said lengths within their recesses, and aconcrete filling around said sleeve.

3. A length of pre-cast concrete pipe comprising a metal lining, annularcollars attached to said lining adjacent the ends thereof, and aconcrete shell encasing said lining and collars, thereby defining endrecesses exterior to said lining and interior to said shell; a secondlength of pre-cast pipe similarly constituted, said two lengths spacedapart, a sleeve joining said lengths within their recesses, and aconcrete filling around said sleeve.

4. A concrete pipe comprising a thin metal lining, flaring collarsadjacent each end of said lining, perforations adjacent the free edge ofeach collar, a shell of concrete encasing said lining and said collars;a second concrete pipe similarly constructed, said two pipes spacedapart end from end, a slip sleeve joining the adjacent ends, flexibleties extending through said perforations in the adjacent collars, and aconcrete filling around said slip sleeve and said ties.

5. A length of pre-cast concrete pipe comprising a sheet metal lining, acollar flaring circumferentially adjacent an end of said lining andexterior thereto, a shell of concrete around said lining and saidcollar, a second length of pro-cast concrete pipe comprising a sheetmetal lining having an end spaced apart from the end of the firstlength, a collar flaring circumferentially adjacent the saidspaced-apart end of the said second lining and exterior thereto, a shellof concrete around said second lining and collar, a sleeve connectingthe adjacent ends of the two said linings, and a filling of concreteextending between the opposite ends of the said concrete shells and intosaid flaring collars.

6. A length of pre-cast concrete pipe comprising a sheet metal lining, acollar flaring circumferentially adjacent an end of said lining andexterior thereto, a shellof concrete around said lining and said collar,a second length of precast concrete pipe comprising a sheet metal lininghaving an end spaced apart from the end of the first length, a collarflaring circumferentially adjacent the spacedapart end of the saidsecond lining and exterior thereto, a shell of concrete around saidsecond lining and collar, a fitting connecting the adjacent ends of thetwo said linings, means tying the twosaid collars together, and afilling of concrete extending around said tying means, between theopposite ends of the said concrete shells and into said flaring collars.

7 A length of pre-cast concrete pipe comprising a sheet metal lining, aflaring collar at the end of said length and exterior thereto, a shellof concrete around said lining, a second length of pre-cast concretepipe having an end opposite and spaced apart from the collared end ofthe first length, a flaring collar adjacent the said opposite end of thesecond length, a fitting connecting the adjacent ends of the saidlengths, and a filling of concrete between the opposite ends of the saidlengths, said filling keying into said flaring collars.

8. A length of pre-cast concrete pipe comprising a sheet metal lining, aflaring collar at the end of said length and exterior thereto, a shellof concrete around said lining, a second length of pre-cast concretepipe with a lining having an end opposite the collared end of the firstlength, a flaring collar adjacent the said opposite end of the secondlength, a fitting slipped over the lining of one length and into thelining of the adjacent length, packing material caulked between thecollar of the said one length and the exterior surface of said fitting,a circumferential band of fabric extending partly over the end of thesecond lining and partly over the said fitting, a plastic material inthe interstices of said fabric, and a filling of concrete encasing thesaid fitting, said filling extending between said lengths of pre-castpipe.

In testimony whereof I sign my name hereto.

THOMAS DE LA MARE.

